Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/89fc79354058
Author: russnicoletti <rnicoletti@mozilla.com>
Desc: Merge pull request #24291 from russnicoletti/bug-1069885

Bug 1069885 - [System][Video][Ringtone]Video app shows Share with ringtone application r=johu

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https://hg.mozilla.org/integration/gaia-central/rev/814654103ee5
Author: Russ Nicoletti <rnicoletti@mozilla.com>
Desc: Bug 1069885 - [System][Video][Ringtone]Video app shows Share with ringtone application

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https://hg.mozilla.org/integration/gaia-central/rev/2c2098e581fe
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #24395 from nullaus/bug1062136

bug 1062136 - getScreenshot should check for frontWindow. r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/cd75ddb0417a
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: bug 1062136 - getScreenshot should check for frontWindow. r=alive
Bumping manifests a=b2g-bump